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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: IEEE Trans Radiat Plasma Med Sci. 2019 Jan;3(1):1–23. doi: 10.1109/TRPMS.2018.2883437

Fig. 1.

Fig. 1.

A model of the left lung defined by different modeling methods; (a) The CSG-type modeling after the Boolean operation (subtraction) is performed involving two ellipsoids; (b) A voxel representation of the lung; (c) A BREP-type of modeling of the same lung using a polygon mesh [5] [6].